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<div class="section" id="changing-colors-of-lines-intersecting-a-box">
<span id="sphx-glr-gallery-api-bbox-intersect-py"></span><h1>Changing colors of lines intersecting a box<a class="headerlink" href="#changing-colors-of-lines-intersecting-a-box" title="Permalink to this headline">¶</a></h1>
<p>The lines intersecting the rectangle are colored in red, while the others
are left as blue lines. This example showcases the <code class="xref py py-obj docutils literal"><span class="pre">intersect_bbox</span></code> function.</p>
<img alt="../../_images/sphx_glr_bbox_intersect_001.png" class="align-center" src="../../_images/sphx_glr_bbox_intersect_001.png" />
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span>
<span class="kn">from</span> <span class="nn">matplotlib.transforms</span> <span class="kn">import</span> <span class="n">Bbox</span>
<span class="kn">from</span> <span class="nn">matplotlib.path</span> <span class="kn">import</span> <a href="../../api/path_api.html#matplotlib.path.Path" title="View documentation for matplotlib.path.Path"><span class="n">Path</span></a>
<span class="c1"># Fixing random state for reproducibility</span>
<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.random.seed.html#numpy.random.seed" title="View documentation for numpy.random.seed"><span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">seed</span></a><span class="p">(</span><span class="mi">19680801</span><span class="p">)</span>
<span class="n">left</span><span class="p">,</span> <span class="n">bottom</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="n">height</span> <span class="o">=</span> <span class="p">(</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="n">rect</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">Rectangle</span><span class="p">((</span><span class="n">left</span><span class="p">,</span> <span class="n">bottom</span><span class="p">),</span> <span class="n">width</span><span class="p">,</span> <span class="n">height</span><span class="p">,</span> <span class="n">facecolor</span><span class="o">=</span><span class="s2">"#aaaaaa"</span><span class="p">)</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <a href="../../api/_as_gen/matplotlib.pyplot.subplots.html#matplotlib.pyplot.subplots" title="View documentation for matplotlib.pyplot.subplots"><span class="n">plt</span><span class="o">.</span><span class="n">subplots</span></a><span class="p">()</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_patch</span><span class="p">(</span><span class="n">rect</span><span class="p">)</span>
<span class="n">bbox</span> <span class="o">=</span> <a href="../../api/transformations.html#matplotlib.transforms.Bbox.from_bounds" title="View documentation for matplotlib.transforms.Bbox.from_bounds"><span class="n">Bbox</span><span class="o">.</span><span class="n">from_bounds</span></a><span class="p">(</span><span class="n">left</span><span class="p">,</span> <span class="n">bottom</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="n">height</span><span class="p">)</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">12</span><span class="p">):</span>
<span class="n">vertices</span> <span class="o">=</span> <span class="p">(</span><a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.random.random.html#numpy.random.random" title="View documentation for numpy.random.random"><span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">random</span></a><span class="p">((</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span> <span class="o">-</span> <span class="mf">0.5</span><span class="p">)</span> <span class="o">*</span> <span class="mf">6.0</span>
<span class="n">path</span> <span class="o">=</span> <a href="../../api/path_api.html#matplotlib.path.Path" title="View documentation for matplotlib.path.Path"><span class="n">Path</span></a><span class="p">(</span><span class="n">vertices</span><span class="p">)</span>
<span class="k">if</span> <span class="n">path</span><span class="o">.</span><span class="n">intersects_bbox</span><span class="p">(</span><span class="n">bbox</span><span class="p">):</span>
<span class="n">color</span> <span class="o">=</span> <span class="s1">'r'</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">color</span> <span class="o">=</span> <span class="s1">'b'</span>
<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">vertices</span><span class="p">[:,</span> <span class="mi">0</span><span class="p">],</span> <span class="n">vertices</span><span class="p">[:,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">color</span><span class="o">=</span><span class="n">color</span><span class="p">)</span>
<a href="../../api/_as_gen/matplotlib.pyplot.show.html#matplotlib.pyplot.show" title="View documentation for matplotlib.pyplot.show"><span class="n">plt</span><span class="o">.</span><span class="n">show</span></a><span class="p">()</span>
</pre></div>
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<p><strong>Total running time of the script:</strong> ( 0 minutes 0.026 seconds)</p>
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